<!DOCTYPE HTML>
<html lang="en-US">

<head>
    <meta charset="UTF-8">
    <title>
        垂直手风琴</title>
    <style type="text/css">
        .accordionMenu {
            background: #fff;
            color: #424242;
            font: 12px Arial, Verdana, sans-serif;
            margin: 0 auto;
            padding: 10px;
            width: 500px;
        }

        .accordionMenu h2 {
            margin: 5px 0;
            padding: 0;
            position: relative;
        }

        .accordionMenu h2:before {
            /*
制作向下三角效果*/
            border: 5px solid #fff;
            border-color: #fff transparent transparent;
            content: "";
            height: 0;
            position: absolute;
            right: 10px;
            top: 15px;
            width: 0;
        }

        .accordionMenu h2 a {
            /*
制作手风琴标题栏效果*/
            background: #8f8f8f;
            background: -moz-linear-gradient(top, #cecece, #8f8f8f);
            background: -webkit-gradient(linear, left top, left bottom,
                    from(#cecece), to(#8f8f8f));
            background: -webkit-linear-gradient(top, #cecece, #8f8f8f);
            background: -o-linear-gradient(top, #cecece, #8f8f8f);
            background: linear-gradient(top, #cecece, #8f8f8f);
            border-radius: 5px;
            color: #424242;
            display: block;
            font-size: 13px;
            font-weight: normal;
            margin: 0;
            padding: 10px 10px;
            text-shadow: 2px 2px 2px #aeaeae;
            text-decoration: none;
        }

        .accordionMenu :target h2 a,
        /*
目标标题的效果*/
        .accordionMenu h2 a:focus,
        .accordionMenu h2 a:hover,
        .accordionMenu h2 a:active {
            background: #2288dd;
            background: -moz-linear-gradient(top, #6bb2ff, #2288dd);
            background: -webkit-gradient(linear, left top, left bottom,
                    from(#6bb2ff), to(#2288dd));
            background: -webkit-linear-gradient(top, #6bb2ff, #2288dd);
            background: -o-linear-gradient(top, #6bb2ff, #2288dd);
            background: linear-gradient(top, #6bb2ff, #2288dd);
            color: #FFF;
        }

        .accordionMenu p {
            /*
标题栏对应的内容*/
            margin: 0;
            height: 0;
            /*
默认栏目内容高度为0
，达到隐藏效果*/
            overflow: hidden;
            padding: 0 10px;
            -moz-transition: height 0.5s ease-in;
            -webkit-transition: height 0.5s ease-in;
            -o-transition: height 0.5s ease-in;
            transition: height 0.5s ease-in;
        }

        /*
这部分是显示内容的关键代码*/
        .accordionMenu :target p {
            /*
展开对应目标内容*/
            height: 100px;
            /*
显示对应目标栏内容*/
            overflow: auto;
        }

        .accordionMenu :target h2:before {
            /*
展开时标题三角效果*/
            border-color: transparent transparent transparent #fff;
        }
    </style>
</head>

<body>
    <div class="accordionMenu">
        <div class="menuSection" id="brand">
            <h2><a href="#brand">Brand</a></h2>
            <p>Lorem ipsum dolor...</p>
        </div>
        <div class="menuSection" id="promotion">
            <h2><a href="#promotion">Promotion</a></h2>
            <p>Lorem ipsum dolor sit amet...</p>
        </div>
        <div class="menuSection" id="event">
            <h2><a href="#event">Event</a></h2>
            <p>Lorem ipsum dolor sit amet...</p>
        </div>
    </div>
</body>

</html>